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apply-flight-data.ts
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apply-flight-data.ts
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import {
CacheNode,
CacheStates,
} from '../../../shared/lib/app-router-context.shared-runtime'
import { FlightDataPath } from '../../../server/app-render/types'
import { fillLazyItemsTillLeafWithHead } from './fill-lazy-items-till-leaf-with-head'
import { fillCacheWithNewSubTreeData } from './fill-cache-with-new-subtree-data'
export function applyFlightData(
existingCache: CacheNode,
cache: CacheNode,
flightDataPath: FlightDataPath,
wasPrefetched: boolean = false
): boolean {
// The one before last item is the router state tree patch
const [treePatch, subTreeData, head] = flightDataPath.slice(-3)
// Handles case where prefetch only returns the router tree patch without rendered components.
if (subTreeData === null) {
return false
}
if (flightDataPath.length === 3) {
cache.status = CacheStates.READY
cache.subTreeData = subTreeData
fillLazyItemsTillLeafWithHead(
cache,
existingCache,
treePatch,
head,
wasPrefetched
)
} else {
// Copy subTreeData for the root node of the cache.
cache.status = CacheStates.READY
cache.subTreeData = existingCache.subTreeData
cache.parallelRoutes = new Map(existingCache.parallelRoutes)
// Create a copy of the existing cache with the subTreeData applied.
fillCacheWithNewSubTreeData(
cache,
existingCache,
flightDataPath,
wasPrefetched
)
}
return true
}